Boring tool



Oct. 24, 1933. w BARTELS 1,931,882

BORINGITOOL Filed June 12, 1933 A TTORNEY.

Patented Oct. 24, 1933 Q v i rrs srrss rs FFiQ 1,931,882 BORING Tool. 'William Bartels, New York, N. r.

Application June 12, 1933. Serial No. 675,351 8 Claims. (01. 145-124 My invention relates to boring tools and more permit its sliding movement. Above said slide particularly tools of the kind, whereby 'cylindriis pivoted to the spindle at 9 a lever 10 Whose lowcal holes can be bored, which gradually become er hook-shaped end, shown at 11 in Fig. 6,1enconically enlarged at the bottom. gages in a recess in the slide. The longer arm The object of my invention is to produce a tool or" the-lever normally'projects upwards and outof this character which is efficient in operation wards, as shown in Figs. 1, 3 ande. and of comparatively inexpensive manufacture, Onspindle 1' is mounted for sliding movement which is strong and durable. thereon a cylindrical guide-member 12 which is The boring tool according to my invention cozn-- held against rotation relative to the spindle by 10 prises a spindle which at its lower extremity is a small screw l3'entering a longitudinal groove iormed with a small centering drill and a small 14 cut in the spindle. The cylindrical guidecutter. In a recess above the the latter is slidmember has a cut-out-portion in the shape of an ably mounted an expanding cutter provided along inverted V, as clearly shown atv 15 in Fig. 5 to its upper edge with a series of fine teeth engaged receive the upper arm of lever 10. At its lower by similar teeth provided along the lower edge edge, the guide-member is provided with a small of a slide also mounted in a' recess and held in catch 16 disposed to engage the lower side of the place by a screw, or the like, extending with play upper arm of lever 10.

through a slot in said slide. With the latter co- To the flattened rear side of the cylindrical operates a small level pivoted to thespindle and guidfi-membiel" i deilachably sficllred y & SCTEW 20 provided below its fulcrum' -with a hool-shaped 17 a stop which, as shown in Figs. 3 and 6, is

end engaging a recess in said slide.- The upward made with a long slot 19 allowing the stop to be and outwardly projecting arm or said lever is so adjusted to different positions, depending on the disposed as to be engaged by a catch on a guid-edepth of the bore-hole.

member slidably mounted on the spindle, but As shown in 6, the spindle 1, if the boring held against rotation thereon. To the said guidetool shall be used on a carpenters brace, is made member is secured for vertical adjustment a stop at its-upper end with a taper of square crosswhereby the depth of the bore-hole may be desection.

termined, The drawing also shows that the expanding The boring tool is so designed that it can be cutter is set at a slight angle being downwardly q used either in a machine, or in a carpenters inclined toward the walls of the bore-hole, where brace, h h l tt event th upper e d 01 th the cutter is provided with a cutting tooth shown spindle, instead ofbeing made cylindrical, is of at 29 111131.19 draV/ingtapering square cross-section. The operation of the tool will readily appear In order to more fully explain my invention, l the foregoing p I refer to the annexed drawing on which I have AS Shown in Fig. h Centering dl'ill 2 holds shown, by way of illustration, a preferred emthe tool in the proper position while the hole is bodiinent or" the invention, and on which Fig. 1 is being bored. Fig. 4 shows the hole of cylindrical a front elevation of the boring tool, Fig. 2 a side shape. As the depth of the hole now progresses, elevation, Fig. a rear elevation; Figs. 4 and 5 the catch 16 at the lower end of the guide-mem- 40 are similar views as Fig. 1 showing the tool in her, while the latter and the spindle move relaoperation, the movable parts being shownin diftive to each other, gradually pushes the lever 10 ferent positions; Fig. 6 is a longitudinal section from its outwardly projecting position as shown along line 6-6 in Fig. 1. in Figs. 1, 3 and 4. to an inward position as shown At 1 is shown the spindle, whose enlarged lowin Fig. 5. As the upper lever arm is being pushed 45 or portion is formed with a small centering drill into the inward position, its hook-shaped lower 2 and a small cutter 3. In a recess in the enend 11 engaging the slide 7 moves the same from larged portion above the small cutter 3 is slidthe position shown in Fig. 4 to the position shown ably mounted an expanding cutter 4 having along in Fig. 5. Because of the meshing teeth along the its upper edge a series of fine teeth 5. In enlower edge of the slide and the upper edge of 50 gagement therewith are corresponding teeth 6 the expanding cutter 4, the latter is gradually beprovided on the upper edge of a slide 7, likewise ing moved outwards from the position shown in mounted in a recess in the enlarged lower por- Fig. 4 to the position shown in Fig. 5 with the tion of the spindle. At 8 is shown a screw for result that while the boring tool is being operholding said slide in place, the said screw extendated, the hole is gradually conically enlarged as 55 ing with play through a slot in the slide, so as to clearly shown at 21 in Fig. 5.

on as The stop 18 fastened to the rear side of the guide-member 12 can be set for any desired depth of the hole to be bored, and is secured in its adjusted position by the screw 1'7.

When the lever 10 is removed and the slide 7 is tightened, the boring tool can be used for boring cylindrical holes.

It will be obvious that the relative position i the slide and the cutter can be varied, so that holes of varying conical widths can be bored. v

Obviously, various changes can be made in the boring tool without a departure from the gist of the invention, and therefore, my invention is,

of course, not limited to the construction'above described and shown on the drawing.

I claim: V 1. A boring tool of the character described, comprising a spindle, a cutter provided at the lower end of said spindle being slidably mounted in a guiding recess therein, a slide in engagement with said cutter for displacing the same laterally relative to said spindle, a member pivoted to said spindle and adapted to operate said slide, and a guiding element'on said spindle movable relative thereto and being operatively associated with said member to thereby move said slide.

2. A boring tool of the character described, comprising a spindle, a cutter provided at the lower end of said spindle being slidably mounted in a guiding recess therein, a slide in engagement with said cutter for displacing the same laterally relative to said spindle, a member pivoted to said spindle'and adapted to operate said slide, and a guiding element on said spindle movable relative thereto and being operatively as- "sociated with said member to thereby move said slide, and means for holding said guiding element against rotation on said spindle.

3. A boring tool of the character described, comprising a spindle, a cutter provided at the lower end of said spindle being slidably'rnounted in a guiding recess therein, a slide in engagecomprising a spindle, a cutter provided at its lower end being slidably mounted in a guiding recessin an enlar ed portion of said spindle and being formed along its upper edge with a series of teeth, a slide adjacent said cutter and having 'teeth'engaging the teeth on said cutter for laterally displacing the same, a lever pivoted on said spindle engaging said slide for operating the same, said lever projecting upwardly and outwardly relative to said spindle, and a guiding element said spindle movable relative thereto for operating said lever for moving said slide.

5. A boring tool as specified in claim l, includ ing a screw for holding said slide in place on said spindle, said screw extending with play through a slot in said side.

6. A boring tool as specified in claim 4,, in which said guiding element is formed with a cut-out portion to receive andguide the upwardly pre jecting lever arm, a catch being provided on said guiding element operatively engaging said lever arm.

7. A boring tool as specified in claim 4, including a stop provided on said guiding element, and means "for adjusting, and securing said stop in position.

8.A boring tool as specified in claim 1, including means, whereby the relative position of the slide and the cutter can be varied.

WILLIAM BARTELS. 

